Concept:The reaction sequence involves a nucleophilic addition of a Grignard reagent to a carbonyl compound, followed by acid hydrolysis to form an alcohol.
Explanation:Step 1: The carbonyl carbon of the starting aldehyde or ketone is attacked by the Grignard reagent, forming a tetrahedral intermediate.
Step 2: Acidic workup (
H3​O+) protonates the alkoxide intermediate to give the corresponding alcohol.
Step 3: The final product depends on the type of carbonyl used – if a ketone, a tertiary alcohol is formed; if an aldehyde, a secondary alcohol is formed.
Step 4: The structure of product
[B] shows the alcohol group attached to the carbon that originally held the carbonyl.
Answer:The correct product is Option B.
